CheckFitment
Bolt patterns and wheel specs by vehicle, wheel and tire fitment, spacer and gear ratio maths.
What it does
CheckFitment is an MCP server, a connector that lets an AI assistant use it as a tool. It is hosted: an assistant connects to it over the internet, nothing to install.
No capability identified yet from its description.
Facts come from the Official MCP Registry, as declared by the publisher. Capabilities are matched automatically (low confidence). None of this is a test of the tool.
At a glance
How to connect
As declared in the Official MCP Registry · hosted endpoint tested by Electra Index 1h ago (live check)Hosted endpoint
https://checkfitment.com/mcp?src=mcpstreamable-http
In Claude Code: claude mcp add --transport http checkfitment https://checkfitment.com/mcp?src=mcp
MCP settings (Claude Desktop, Cursor and other MCP clients)
{
"mcpServers": {
"checkfitment": {
"url": "https://checkfitment.com/mcp?src=mcp"
}
}
}Live check
Electra Index connected to the hosted endpoint 1h agoONLINE CheckFitment answered an MCP connection on 24 Oct 2026 and introduced itself as checkfitment 1.1.0 (MCP protocol 2025-06-18).
6 tools offered to AI assistants
bolt_pattern_lookup· Use for "what is the bolt pattern on a 2019 Ford F-150", lug torque, center bore, thread size, OEM wheel size, offset or tire size of a vehicle, or "will these wheels fit my car" when the vehicle is named. Looks the vehicle up in the CheckFwheel_fitment_check· Use to compare a current wheel (and tire) with a new one: how far the outer edge pokes toward the fender and the inner edge toward the suspension, the diameter and ride-height change, speedometer effect, backspacing, and whether the new tirtire_size_compare· Use for "what changes if I go from 265/70R17 to 285/75R17", "how far off is my speedometer with 33s", or odometer error after a tire change. Returns diameter, width, sidewall and ride-height change, the true speed when the speedometer showswheel_spacer_calculator· Use for "do I need spacers", "what spacer gets +35 wheels to +20", "is a 10 mm slip-on spacer safe". A spacer lowers the effective offset by its thickness. Returns the spacer needed for a target offset (and the nearest common size), the effgear_ratio_calculator· Use for "what does my 3.73 axle behave like on 35s", "what ratio do I need to regear for 33s", RPM at highway speed after a tire change, or the crawl ratio (with transfer-case low ratio and first gear). Returns the effective ratio, RPM befobolt_pattern_facts· Use for "what is 5x114.3 in inches", "is 5x114.3 the same as 5x115", "will 6x135 wheels fit 6x139.7", or which vehicles use a pattern. Converts mm and inch notation, lists look-alike patterns that do not interchange, the vehicles in the dat
What "online" means: the server answered an MCP connection at the time of the check. It is not a guarantee of security, quality or continuous uptime. How we test: we open an MCP session and ask for the tool list, as an AI assistant would. We never run a tool and never send a key. Checked every few days. Method
Is this your server? Monitoring Pro: a check every 30 minutes and an email within the hour when it stops answering. Launch offer: $39.99 once, for life.
Facts & evidence
Each fact shows where it was seen and when.| Fact | Value | Evidence | Source | Last confirmed |
|---|---|---|---|---|
| Hosted endpoint | https://checkfitment.com/mcp?src=mcp | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Local install (package) | no | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Remote access (hosted) | yes | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Website | https://checkfitment.com/ai-assistants/ | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Registry status | active | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Version | 1.1.0 | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| MCP server | yes | DECLARED | SRC-001 Official MCP Registry | 2h ago |
Change history
- NEW24 Oct 2026first seen in the index
Is this page accurate?
Flag it and our robot re-checks the official source. Reports never change a score.Is CheckFitment still online?
Free alerts · no accountQuestions about CheckFitment
How do I connect CheckFitment?
Use the hosted endpoint https://checkfitment.com/mcp?src=mcp in your assistant's MCP settings. The exact settings are in "How to connect" above, as declared in the Official MCP Registry.
What tools does CheckFitment offer?
When Electra Index connected on 24 Oct 2026, it listed 6 tools: bolt_pattern_lookup, wheel_fitment_check, tire_size_compare, wheel_spacer_calculator, gear_ratio_calculator, bolt_pattern_facts. The full list is in "Live check" above.
Is CheckFitment online?
Yes. Its hosted endpoint answered an MCP connection from Electra Index 1h ago.